// Copyright 2024 Ant Group Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include "absl/strings/escaping.h"
#include "yacl/crypto/rand/rand.h"

namespace psi {

inline std::string GetRandomString(size_t length = 16) {
  auto bytes = yacl::crypto::SecureRandBytes((length + 1) / 2);
  constexpr char kPathChars[] =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
  std::string ret(length, '_');
  size_t index = 0;
  while (index < length) {
    ret[index] = kPathChars[bytes[index / 2] / 64];
    index++;
    if (index >= length) {
      break;
    }
    ret[index] = kPathChars[bytes[index / 2] % 64];
    index++;
  }
  return ret;
}

}  // namespace psi
